Assuming you mean it repeats indefinitely, you call your number "x", and write:x = 0.66666...
10x = 6.66666...
You subtract the first equation from the second, then solve the resulting equation for "x".
Note: In other cases, if two digits repeat, you multiply by 100 to get the second equation; if three digits repeat, you multiply by 1000, etc.
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Convert 5.75 to a fraction
Convert the fraction to a decimal and then multiply by 100.
You can convert a fraction into a decimal by dividing the numerator by the denominator. 3/9 is .33333333333.
To convert a fraction to a decimal, divide the denominator into the numerator. Whether it is recurring or not depends on the fraction.
Convert the mixed fraction to an improper fraction, multiply by the whole number, convert the answer back to a mixed fraction (if required).